[PATCH] [libcxx] Update the way the -std= flag is chosen by CMake and LibcxxTestFormat

[Eric Fiselier]

I've dropped support for C++0x. 

This patch is somewhat related to this bug. If this patch is merged the CMake build system will require that libc++ be built with c++11 or greater. 
http://llvm.org/bugs/show_bug.cgi?id=13081

http://reviews.llvm.org/D4329

Files:
  CMakeLists.txt
  cmake/config-ix.cmake
  test/CMakeLists.txt
  test/lit.cfg
  test/lit.site.cfg.in
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